For HDPE pipe manufacturing, a single screw extruder is generally the preferred choice. HDPE is typically processed in pellet form, and a single screw extruder provides efficient melting, conveying, and consistent extrusion of the material. It also has a simpler design, lower investment cost, and easier maintenance compared with a twin screw extruder. https://uniqueextrusion.com/twin-screw-vs-single-screw-extruder/